We were dating for 4 yrs now. During all this time I was more of caring and less of expressing one whereas she was more of expressive one. We both studied in the same college but different classes yet could spend reasonably good time with each other. She used to complain of my nature I.E. lack of expression of love for her but I always thought that its her childish behavior typically girl types as we men think.

But eventually she lost all her patience in waiting for me to realize what she actually wanted. She broke up with me some 5 months ago and since then its all going wrong at least in my life. Now I do realize what she wanted and what she meant. I know now very well what mistakes I made in these 4 yrs and I want to mend them. I have been requesting her since then to give me 1 last chance but she is reluctant to do so.

I know through her close friends (a common friend from the same college) that though she says she doesn't feel for me no more but the fact is that she does the thing is she is just too tired now of my behavior. She has also admitted it before me that she fears that what if after some time my behavior returns back to what it was earlier and hence she doesn't want to get into it again.

Another reason is that her parents won't approve our relation due to inter caste issues and hence eventually it will end up in separation later as well. But my heart is not ready to accept this. I strongly feel that I will win the hearts of her parents with the help of her elder sister who approved our togetherness.
I'm very confused and need some SERIOUS SENSIBLE ADVICE. PLEASE HELP

My advice is give her some space and let her decide if she is going to be a willing partner or not.

Let her miss you, and see, and be convinced of those changes for herself. In the mean time get your act together, and show YOURSELF you can change for the better and do very well without her.

Her vfriends are watching, maybe she is too!

If her issue with you is your lack of expression - show her! Send her a card or something. Don't just sign the thing - write something from the heart in it. Little things like that say a lot.But don't PUSH or harrass!! Once you do that once or twice - see how she FEELS about what you are doing. Then, ask if you stand a chance of working things out.
And if things are falling apart for you - you need to refocus your energies and quit obsessing... that's what it sounds like is happening. That, or maybe little things seem so big for you right now.